Nearly 90 elephants have been found dead at a wildlife sanctuary in Botswana, with most believed to have been slaughtered for their tusks.
According to Elephants Without Borders, the scale of the deaths is the largest in Africa.
It is understood that 87 of the elephants were poached for their tusks, with five white rhinos also slaughtered in the last three months.
This comes just months after anti-poaching units were disarmed.
"I'm shocked, I'm completely astounded. The scale of elephant poaching is by far the largest I've seen or read about anywhere in Africa to date," Elephants Without Borders' Dr Mike Chase said, reports the BBC.
"When I compare this to figures and data from the Great Elephant Census, which I conducted in 2015, we are recording double the number of fresh poached elephants than anywhere else in Africa."